Fofanov says the 125mm's recoil length on the MBT's are at 310mm hard stop, Rh120 is at 500mm (I think, the brochure doc for the gun has really unusual english). But Russian MBT's also don't necessarily have 'strong' suspensions like the NATO mbts and are much lighter. So they dont have to give much care to ground pressure and track size due to their weight being 20+ tons less than the West. And just as said the K2's hydro suspension will help a bit with absorbing the force from firing, just like the Leclerc and admittedly CR2, though watching them fire with the additional weight packages makes them seem like unmovable bunkers instead of 'stable firing platforms'.
It really comes down to how heavy you are which makes it harder to push, how much is being absorbed and how stable you are. Russian tanks don't have a reason to care much for this since they're smaller, tighter, and lighter. Plus with a stabilized sight as with all modern vehicles have, you're not having your eyes forced off target for the next shot.